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CN-121976868-A - Method for preventing ice blockage of high and cold oil pan strainer

CN121976868ACN 121976868 ACN121976868 ACN 121976868ACN-121976868-A

Abstract

The invention discloses a method for preventing ice blockage of a strainer of an oil pan with high and cold temperatures, which relates to an engine lubrication system, and comprises the steps of installing the strainer at an oil taking end of a low-pressure oil pipe in a sliding sealing mode, and enabling an initial position of the strainer to be positioned in upper-layer engine oil of the oil pan; when the engine is started, the current ambient temperature is acquired, if the ambient temperature is greater than or equal to a set temperature threshold value, the strainer is controlled to move from the upper layer engine oil of the oil pan to the bottom of the oil pan, if the ambient temperature is less than the temperature threshold value, an oil pressure building marker bit in the lubricating system is acquired, if the oil pressure building marker bit in the lubricating system is set, the engine oil temperature is acquired, the movement amount of the strainer is controlled according to the engine oil temperature until the engine oil temperature is the set normal oil temperature threshold value, and when the engine oil temperature is the set normal oil temperature threshold value, the strainer is positioned at the bottom of the oil pan. The invention reduces the risk of ice blockage/freezing of the strainer and ensures the lubrication reliability when the engine is started.

Inventors

  • HE HUIXIN
  • LIU ZHIZHI
  • WEI ZUANGUO
  • LIN TIEJIAN
  • NING DEZHONG
  • SHENG LI
  • CHEN HUAN
  • TAN ZONGHUI

Assignees

  • 广西玉柴机器股份有限公司

Dates

Publication Date
20260505
Application Date
20260228

Claims (8)

  1. 1. A method for preventing ice blockage of a high and cold oil pan strainer, which is characterized by comprising the following steps: the method comprises the steps that a strainer (6) is arranged at an oil taking end of a low-pressure oil pipe (3) in an oil pan (1) in a sliding sealing mode, and an initial position of the strainer (6) is located in upper-layer engine oil of the oil pan (1); When the engine is started, acquiring the current ambient temperature, and if the ambient temperature is greater than or equal to a set temperature threshold value, controlling the strainer (6) to move from the upper-layer engine oil of the oil pan (1) to the bottom of the oil pan (1); and if the ambient temperature is smaller than the temperature threshold, acquiring an oil pressure building flag bit in the lubricating system, if the oil pressure building flag bit in the lubricating system is set, acquiring the engine oil temperature, controlling the movement amount of the strainer (6) according to the engine oil temperature until the engine oil temperature is a set normal oil temperature threshold, and when the engine oil temperature is the set normal oil temperature threshold, positioning the strainer (6) at the bottom of the oil pan (1).
  2. 2. Method for preventing ice blockage of a high and cold sump strainer according to claim 1, characterized in that the strainer (6) is driven by a hydraulic lifting mechanism, and that hydraulic oil acting on the hydraulic lifting mechanism is taken from the oil outlet of the oil pump (2) via a high pressure oil pipe (7).
  3. 3. Method for preventing ice blockage of a high-cold oil pan strainer according to claim 2, characterized in that a solenoid valve (14) is installed in the high-pressure oil pipe (7), and that the solenoid valve (14) is a two-position three-way solenoid valve or a two-position four-way solenoid valve.
  4. 4. A method for preventing ice blockage of a high and cold oil pan strainer according to claim 3, characterized in that the method for controlling the movement amount of the strainer (6) according to the oil temperature is specifically: And setting a relation curve of engine oil temperature and PWM signals, and outputting the corresponding PWM signals to the electromagnetic valve (14) by the ECU according to the engine oil temperature so as to control the opening of the electromagnetic valve (14) and enable the movement amount of the strainer (6) to be the movement amount matched with the current opening of the electromagnetic valve (14).
  5. 5. Method for preventing ice blockage of a high-cold oil pan strainer according to claim 2, characterized in that a temperature sensor and a pressure sensor (15) are installed in the high-pressure oil pipe (7).
  6. 6. The method for preventing ice blockage of a high and cold oil pan strainer according to claim 2, wherein the hydraulic lifting mechanism comprises a hydraulic cylinder body (8), an in-cylinder spring (9) and a piston rod (10), one end of the hydraulic cylinder body (8) is fixed on a low-pressure oil pipe (3), the piston rod (10) is installed in the hydraulic cylinder body (8), the in-cylinder spring (9) is arranged between the hydraulic cylinder body (8) and the piston rod (10), one end of the in-cylinder spring (9) is in end face contact with one end face of the piston rod (10) located in the hydraulic cylinder body (8), the other end of the in-cylinder spring (9) is in contact with a sealing piece at the other end of the hydraulic cylinder body (8), and the piston rod (10) is installed on the strainer (6).
  7. 7. The method for preventing ice blockage of a high cold oil pan strainer of claim 1, wherein the temperature threshold is-5 ℃.
  8. 8. The method for preventing ice blockage of a high and cold oil pan strainer of claim 1, wherein the normal oil temperature threshold is-4 ℃ to-5 ℃.

Description

Method for preventing ice blockage of high and cold oil pan strainer Technical Field The present invention relates to engine lubrication systems, and more particularly, to a method for preventing ice blockage of a high and cold sump strainer. Background The fluidity of engine oil decreases with decreasing temperature, and the viscosity increases or even gels. Ignition engines (e.g., natural gas/hydrogen/methanol engines), because of the high moisture content of the combustion products, some of the water vapor may enter the sump through the crankcase ventilation system and condense in the sump to form an oil-water mixture (or "oil emulsion"). When the engine is stopped, the engine oil and the water are layered up and down due to different densities, and the water content is higher as the engine oil and the water are separated down. When the engine operates in a high and cold environment, the viscosity of engine oil is increased, the fluidity is poor, the oil-water mixture near the bottom of the oil pan can be frozen into ice residues or ice cubes, and the engine oil at different height positions in the oil pan is in frozen states with different degrees up and down due to different water contents. As shown in fig. 1, in a conventional engine oil lubrication system, a strainer (commonly referred to as an "oil pan") is installed in an oil pan, and is fixed to the bottom of the oil pan. When the engine is started in a cold environment under a severe cold environment, according to the analysis, the frozen matter at the bottom of the oil pan is very easy to block the oil inlet of the strainer, so that the oil pump cannot absorb oil normally, the whole engine lubrication system is easy to lose pressure in the initial stage of starting, and each friction pair (such as a crankshaft, a camshaft, a piston and the like) is subjected to dry friction in an oil-deficient state, so that serious instantaneous wear is caused, and even serious faults such as cylinder pulling, tile holding and the like are caused. Currently, the main method for solving the problem is passive, for example, a heating device (such as an electric heating plate and a cooling liquid heating coil) is additionally arranged on an oil pan, but the method has high energy consumption, slow response, limited effect under extremely cold conditions and increased complexity and cost of the system. For another example, more low temperature resistant engine oil is used, but the cost of the method is still higher, and the risks of frozen products and blockage of the strainer cannot be fundamentally avoided. Disclosure of Invention Aiming at the defects of the prior art, the invention provides the method for preventing the ice blockage of the strainer of the high and cold oil pan, reduces the risk of ice blockage/freezing of the strainer, and ensures the lubrication reliability when the engine is started. The invention relates to a method for preventing ice blockage of a high and cold oil pan strainer, which comprises the following steps: the method comprises the steps that a strainer is arranged at an oil taking end of a low-pressure oil pipe in an oil pan in a sliding sealing mode, and the initial position of the strainer is located in upper-layer engine oil of the oil pan; When the engine is started, acquiring the current ambient temperature, and if the ambient temperature is greater than or equal to a set temperature threshold value, controlling the strainer to move from the upper-layer engine oil of the oil pan to the bottom of the oil pan; And if the ambient temperature is smaller than the temperature threshold, acquiring an oil pressure building flag bit in the lubricating system, if the oil pressure building flag bit in the lubricating system is set, acquiring the oil temperature, controlling the movement amount of the strainer according to the oil temperature until the oil temperature is a set normal oil temperature threshold, and when the oil temperature is the set normal oil temperature threshold, positioning the strainer at the bottom of the oil pan. Preferably, the strainer is driven by a hydraulic lifting mechanism, and hydraulic oil acting on the hydraulic lifting mechanism is obtained from an oil outlet of the oil pump through a high-pressure oil pipe. Preferably, an electromagnetic valve is installed in the high-pressure oil pipe, and the electromagnetic valve adopts a two-position three-way electromagnetic valve or a two-position four-way electromagnetic valve. Preferably, the method for controlling the movement amount of the strainer according to the engine oil temperature specifically includes: and setting a relation curve of engine oil temperature and PWM signals, and outputting the corresponding PWM signals to the electromagnetic valve by the ECU according to the engine oil temperature so as to control the opening of the electromagnetic valve, so that the movement amount of the strainer is the movement amount matched with the current opening